Air and water tube for rock drills



F. M. SLATER AIR AND WATER TUBE FOR ROCK DRILLS March 31, 1925.

Fii'ed April 5. 1924 HI 5 ATTOR EY INVENTOR IZ'edMJIaZa 7% 7 5 C L J 5 w J z b Z m/V/A/ fl/ .5411. w f 2 'V\ g. A A

i To all it may concern:

Patented Mar. 31, 1925.

UNIT o STATES PATENT OFFICE.

. REI) m. SLATER, 0E Ensron, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COM- PANY, or ERSEY cr'rrynnw JERSEY, A CORPORATION or NEW JERSEY.

A13 AND WATER TUBE FOR ROCK mums.

Application filed April 3, 1924. Serial No; 703,868.

Be itiknownfthatl, FRED M. SLATER, a

' citizen of" the United Statesfanda resident of Easton, county of Northampton, and

State of; Pennsylvania, have invented a oer tain Airand Water Tube for Rock Drills, of

which the following companied by'drawings. Q I This invention relates to fluid actuated percussivelmachines, but more particularly to rockdrills of the hammer type which em- W ploy concentrically arrangedliquidconveyingand gaseous fluid conveying tubes for "introducinga mixture ofli'quid and gaseous fluid, "such as water and air, into the drill steel for cleansing the: drill hole.

water, for washing the cuttings from the drill hole. ,In order that there may be; suf- 1 Inorder to cleanse the drill hole, most rock drills ofthe hammer type employ a 1 tube which extends through the machine and;

, communicates with the hollow drill steel for conveying liquid. under ;-pressure,- usually ficient pressure. upon this water, some of the pressurefluid which is employedfor actuating the hammer'piston, is usually permit-l ted to escape into the. drillsteel and mix with the water and thereby create a greater pressure to remove. the cuttings. some circumstances, however, there is insufiicient pressure fluid escaping past the hammer piston to remove the cuttings'and two concentrically arranged tubes have been used, one of which is ada'pted to convey gaseous fluid and the other-a liquid. In this manner the amount of pressure fluid introduced into the drill steel may be materially increased, -so thattheiremoval of the cutin drawings, in which tings'from the drill hole may be efliciently effected.v J i i One object of this invention is to enable concentrically arr'ange d gaseous fluid and liquid: conveying tubes to be "securely held in place'in a rock drill. of the hammer type by an improved and simplified means.

Further objects of the invention will here one of its preferred forms inthe accompany igure l is a vertical sectional elevation of a stope drill with some of the parts broken away *1 e a l p I "is i a specification ac- Under a Figure 2 is an enlarged detail sectional elevation of the back head with the concentrically arranged tubes connected thereto,

- and a cylinder A to which'the'front head B is attached by the usual spring pressed-bolts (not shown) The percussiveelement in this instance comprises the piston C having a forward fluted extension D which is adaptedto reciprocate in the bore of the cylinder 7 The forward fluted extension D of the piston extends through the front cylinder washer E and engages the internal flutes on the chuck F. In this instance an anvil block G is located in the chuck F and "is adapted to permit the iin pact blows of the piston G- 'tothe hollow drill steel H which is adapted to extend through the bushing J into the front head B. In this instance, the piston C is provided with a rifle nut K into which the rifle to rotate in one direction until this rotation is permitted through the chuck F to the drill steel H so that the drill steel H continually rotates in" one direction. a The back head or head block S closes one end of the ratchet ring Qand the feed cylinder T is connected to the back heads byside bolts which is in this instance located in the back head S and is adapted to be manipulated by a suitable valve lever lV.

Concentrically arranged tubes X and Y are in this instance held in the back head S and the tube Y, which is preferably inside the tube X, is formed with a nozzle Z which extends through the rifle bar head 0, the rifle bar L, piston C and into the anvil block G and is adapted to supply liquid to the hollow bore of the drill steel H. The tube Y is formed with nozzle Z and the tube X, which is outside the tube Y, also extends. through the rifle barhead' O, rifle bar L, piston, G and a short distance intothe envil' block G. A chamber a is preferably provided in the anvil block Gr between the end of the tube X and the counter bore Z) in the anvil block intowhich the nozzle Z of the tube Y extendsv In this instance, both the tubes X, and Y are secured? tothe back head 5- and for this purpose; the back head is formed with a recess 0- having a counterbore (Z. The outer tube X is; preferably formed with an outwardly flared end portion. 0, which isadapted to be forced; to: a tapered seat in the back head S by a suitable plugthrough: which the tube Y is adapted to extend and which has atapered end portion 9 adapted to bear against the flared end portion e. The plug f is preterably provided with a, transverse port It WlIlilCllgCOlDIIlllIllCtttQS with the hollow bore of the tube X at its center and also communicates with a passage j in the back througha port is in the valve V. By manipulating the valve lever in order to bringthe valve port is and the passage 7' into reg istration, a gaseonsflnid willbe supplied: to thetube X from which it will pass through the anvil block (sr and into-the hollow bore of; the drill steel: H.

In order to secure the liquid conducting tube Y in the backrhead S, an annular collar 0 is preferably termed on the tube Y adjacent one end thereof and an external" screw threaded plug 79 is formed; with a bore (7 and a; counter borer. @neend: of: the tube Y is, in this'instance, adapted to extend a short distance; into the counter bore hand the; collar: 0- lies in the bore 9. A gland s is preferably screwed into the bore 9 of the: plug and is adapted to bear against the collar 0 on the tube Y for the driving movement ot the tube Y relative-tox the plug 20,. An aperture plug t may beinserted in one endof: the plug 79 if desired. The plug 10 in this instance extends a slight distance beyond; the back head S and a cap u is adapted to be sorewedionto the plug; 79. and a, suitable packing a may be inserted; between the. cap. a, and; the back head S for. forminga fluid. tight. connection: therebetween, Inorderto supply liquid to the tube Y, a passage 10 is preferably formed in the back head S and a longitudinal passage 00 is preferably formed in the plug 22., Liquid, such as water, is adapted to be introduced, in the passage to through a suitable inlet connection 3 and water will flow through the pas sage to into the longitudinal passage 0 and into the chamber .2 formed between the plug- 12 and the cap a and thence through the counter bore 1' into the tube Y. A suitable packing washer 2. may be interposed between the plug p and the plug about the tube Y in order to prevent relative movement of the parts and to maintain the tapered portion g of the plug 7? against the flared portion a of the tube m; y l he packing 2 is adapted to be tightly pressed: against the tube Y by theplug 27 and in this instance a washer is located between thepacking 2' and gland s.

The plug 1), the tube Y and the gland 8 maybe removed from the back head S as a unit in. order to inspect the tube 1 or for any other' reason. Although the tubes X and Y are shown connected to the back head S of a stope drill it is to be understood that these tubes may be connected to a rock drill of the drifter type and! that any conveni'ent cleansing liquid such as water may be supplied directly to the tube Y through the plug 29 and this invention is not to be understood as limited to the embodiment shown in; the drawings such as defined: in theappended claims. It will be observed that the tube X is somewhat shorter than thetube Y and this arrangement enables additional pressure to'be created? on the liquid flowing from the nozzle Z oi the tube Y for of feetivel-y cleansing the drill hole. It 1s preferable that a gaseous pressure fluid be supplied to the tube X slightly before'it is admitted to the percussive element in order to l'r'eep the drill hole free from the cuttings, although this feature is not'esse-ntial to the invention;

I claim:

1 In a rock drill, the" combination with a cylinder, of percussive means: therein, a hollow drill steel, a back head for said cylinder, separate gaseous fluid and liquid conducting tubes communicating with said steel and terminating at their rear ends in said back head, means for removably securing one of said tubes in. said. back head and atapered: plugadapted' to'bea-r against the other oi? said tubes in, said back head;

2; 1111 a: rockdrillgthe combination with a cylinder; (at-percussive means therein, a hole low drill steel, a backhead for said cylinder, separate concentrically disposed gaseous fluid and liquid conducting tubes communicating with said steel and termiimting at their; rear end in said head, a, separate end portion on onset-said: tubesiadapted to seat against said back head, means-adapted; tocooperate withsaid flared end portion for holding said tube in said back head, a plug connected to said back head and means for der, separate concentrically disposed gaseous fluid and liquid conducting tubes communicating with said steel and terminating at their rearends in said back'head, a tapered end portion on the rear end of one of said tubes adapted to seat against said back head,

a tapered plug having a hollow bore adapted to cooperate with said tapered end portion for holding said tube in place in said back head, a plug in said back head having a hollow bore intowhich the other of said tubes is adapted to extend and a gland connected to said plug for holding said last mentioned tube in place in said plug.

In testimony whereof I have signed this specification.

FRED M. SLATER. v 

